Centrifugal governor for injection internal combustion engines

ABSTRACT

A centrifugal governor for an injection internal combustion engines of the supercharging type. A lever is connected to an interlocking rod to be axially thrusted by the centrifugal force of governor weights, and an oscillating lever opposes the thrust of the interlocking rod and is subjected to the force of a spring. An auxiliary lever has as a supporting point an engaging point with a stopper bolt disposed in the oscillating lever and as acting points first and second pins pivotally connecting the oscillating lever to said interlocking rod. A follower lever displaces a control rod and a spring stretched between the first mentioned lever and the auxiliary lever so that in the supercharged rotation limits of an engine, the control rod is displaceable through the follower lever by means of the thrust of the interlocking rod and the oscillation of the auxiliary lever with respect to the force of the spring acting on the second pin.

United States Patent [151 3,659,570

Yoshino [4 1 May 2, 1972 54 CENTRIFUGAL GOVERNOR FOR 2,767,700 10/1956Parks ..123/14o INJECTION INTERNAL COMBUSTION ENGINES PrimaryExaminer-Manuel A. Antonakas Attorney-Larson, Taylor and Hinds [57]ABSTRACT A centrifugal governor for an injection internal combustionengines of the supercharging type. A lever is connected to aninterlocking rod to be axially thrusted by the centrifugal force ofgovernor weights, and an oscillating lever opposes the thrust of theinterlocking rod and is subjected to the force of a spring. An auxiliarylever has as a supporting point an engaging point with a stopper boltdisposed in the oscillating lever and as acting points first and secondpins pivotally connecting the oscillating lever to said interlockingrod. A follower lever displaces a control rod and a spring stretchedbetween the first mentioned lever and the auxiliary lever so that in thesupercharged rotation limits of an engine, the control rod isdisplaceable through the follower lever by means of the thrust of theinterlocking rod andthe oscillation of the auxiliary lever with respectto the force of the spring acting on the second 2 Claims, 3 DrawingFigures Patented May 2, 1972 7 3,659,570

2 SheetsSheet l FIG.I

IIIIIIIIIIIIIIIII 7 A 8 a-i Patented May 2, 1972 2 Sheets-Sheet Z FIGZCENTRIFUGAL GOVERNOR FOR INJECTION INTERNAL COMBUSTION ENGINES Thisinvention relates to a centrifugal governor for injection internalcombustion engines with a fuel supercharger, utilizing a conventionalcentrifugal governer mechanism for increasing supply of fuelcorresponding to the supercharged air amount in a diesel engine having asupercharger.

Generally the governors with a supercharger are a compression typegovernor in use of supercharging pressure in the suction pipe of air(Refer to Japanese Utility Model Publication SHO 35-16401) and acentrifugal governor effecting mechanical supercharging to be operatedby a centrifugal force of governor spindle variable with rotation speed(Refer to Japanese Pat. application Sl-IO 40-22394). However, thecompression type of the centrifugal governor has had the drawback ofdelay of response caused from intermediary gas, while the mechanicalsupercharging system involves the problems of exceedingly large space ofinstallation, high cost, and instability of performance due tocomplicated construction.

This invention has for its object to provide a centrifugal governor witha mechanical supercharger, which utilized a conventional centrifugalgovernor, eliminated such delay of response by full mechanical operationand simplifies procedure of operation with very small construction,whereby a very accurate operation can be obtained.

The invention will be illustrated with reference to the drawings, inwhich FIG. 1 shows a vertical sectional elevation view of a conventionalcentrifugal governor,

FIG. 2 shows a similar view to FIG. 1 to the governor of which isapplied a governor according to this invention, and

FIG. 3 shows an illustrative view of operation of the governot of FIG.2.

In FIG. 1 is shown a full speed governor for non-supercharging enginesof the conventional type. Due to variation of rotation speed of camshaft 1 in an injection pump not shown, tension force of a governorspring 2 applied on an oscillating lever 3 and thrust by centrifugalforce of the governor weight 4 are in equilibrium, so that displacementis caused in the axial direction (horizontally) of a connecting rod 5which is an intermediary member. The connecting rod 5 is connected bypin 9 with a lower end of a lever 8 suspended revolvably by an upperfixed pin 7 on a cover 6 of the governor. In an intermediate portion ofthe lever 8 is affixed a pin 10, which is engaged with an intermediateportion ofa follower lever 12 having its lower end pivoted on a lowerfixed pin 11 of the cover 6. A link 13 is connected to an upper end ofthe follower lever 12 and is further connected to a fuel control rod 14.The governor spring 2 is suspended between the middle part of theoscillating lever 3 and an end of a control lever 16 pivotally mountedon a fixed pin 15 of the governor cover 6. The other end of the controllever 16 is connected to an axle pedal 17 through linkage. There isobtained therefore a tension force of the spring 2 equivalent to astepped amount of the axle pedal 17, whereby operation of a full speedgovernor can be effected. Thus, the control system comprises a controlmechanism in which the above described displacement of the connectingrod 5 due to equilibrium of the thrust of the governor weight 4 producedby rotation and the tension force of the spring 2 revolvessimultaneously the lever 8 by pin 10 in the intermediate portion of thelever 8, and control the fuel control rod 14 through a link 13.

The governor according to the present invention compared with the abovedescribed mechanism, includes the following features. As shown in FIG.2, a connecting rod 5a is attached revolvably to a lower end of anauxiliary lever 18 with pin 19. Spring 20 is mounted in tension betweenupper part 18b of the auxiliary lever 18 and an intermediate portion ofthe lever 8a so that the upper end 18a of the auxiliary lever 18 and thelever 8a will not separate until the force of the auxiliary lever 18revolved counterclockwise reaches a predetermined value due to the righthand movement in the drawing of the rod 50 and engages the intermediateportion of the auxiliary lever 18 revolvably with the intermediateportion of said follower lever 12 by a pin 10a. Accordingly, the pin 10of the lever 8 is omitted and the lever 8a is interlocked with thefollower lever 12 through the spring 20, auxiliary lever 18 and pin 100.On the other hand, a boss 3b at the lower end of the oscillating lever3a is screwed with a stopper bolt 21 abutting the boss 18c between thepin 10a of the auxiliary lever 18 and the intermediate portion of thepin 19 said stopper bolt being affixed at a desired position by a nut22.

In FIG. 3, point a shows an acting point on the pin 19 of FIG.2; point12 a fulcrum of the auxiliary lever 18 by stopper bolt 21; point c afulcrum for the pin 10a; point d a fulcrum for the fixed pin 11; andpoint e an acting point for the link 13 of the follower lever 12.

Operation of the governor according to the present invention will now beillustrated. Assume that a force produced by the initial tension of thespring 20 pulling the pin 1011 at point e to the right in the drawing isF,, an interval between the forward end 5b of the connecting rod 5a andthe oscillating lever 3 when the forward end of the stopper bolt 21abuts the boss is l; and thrust of the governor weight in the sameposition is P In FIG.3, the interval 1 in the rotation range of H5 F 55'F 1 is not variable but is constant. When by further rotation, there isproduced a relationship of F5 F E- F the connecting rod 5a moves in thedirection such that I may diminish and is displaced until l=0. As theauxiliary lever 18 connected to the connecting rod 5a is supported atthe point 12 by the stopper bolt 21, the pin 19 is displaced in thedistance 1 from the point a to the point 0 when l=0, whereby theauxiliary lever 18 revolves counterclockwise on the fulcrum b. The pointc is moved to the point e, on the auxiliary lever 18, then the followerlever 12 revolves counterclockwise as fulcrum on the point d at thelower end thereof and the point e at the upper end is displaced to thepoint (2,. Therefore, the displacement from the point e to the point eshows the displacement of the fuel control rod 14 corresponding to thesupercharged air and the fuel is so much supercharged. The ratio ofdisplacement e of the connecting rod 5a and the fuel control rod 14 atthe time of supercharging can nearly be set up as obtained in theformula:

JjE 63715 As hereinbefore described, the centrifugal governor of thepresent invention is featured by the construction provided only with oneauxiliary lever 18, a spring 20, an oscillating lever 3, and a stopperbolt 21. The governor can be manufactured at low cost, spacially same asthe conventional governors for non-supercharging engines, and sure inoperation because of the simple mechanism. Though the above describedembodiment relates only to the full speed governor, the invention,comprises a mechanism for displacing the fulcrum c of the follower lever12, so that it may have a wider application either in high or low speedgovernor.

I claim:

1. A centrifugal governor for a fuel injection internal combustionengine of the supercharging type comprising:

a housing,

a connecting rod axially movably mounted in the housing,

governor weights movable outwardly under centrifugal force, such weightsmounted to move the said connecting rod axially as the weights moveoutwardly,

a first lever connected at a point to the connecting rod, said point onthe first lever being movable axially with the connecting rod,

an oscillating lever mounted on a pivot axis which is fixed with respectto the housing, said oscillating lever positioned in the path of theconnecting rod, a spring attached to theoscillating rod and urging thesame in opposition to the axial movement of the connecting rod,

a follower lever mounted for pivoting movement about an axis whichisfixed with respect to the housing, a control rod connected to andmovable in response to movements of the follower lever,

and an auxiliary lever pivotably connected to both the connecting rodand the follower lever, a second spring urging the auxiliary leveragainst the first lever in opposition to the force of the governorweights acting on the auxiliary lever through the connecting rod, and astop element fixed to the oscillating lever and arranged to abut theauxiliary lever at a fulcrum point between the auxiliary lever pivotpoints before the control rod engages the oscillating lever,

the force of the second spring being such that a predeterstop elementcomprises a bolt threadedly engaged in the oscillating lever andengaging said auxiliary lever such that the axial position of the boltrelative to the oscillating lever and the fulcrum is adjustable.

1. A centrifugal governor for a fuel injection internal combustionengine of the supercharging type comprising: a housing, a connecting rodaxially movably mounted in the housing, governor weights movableoutwardly under centrifugal force, such weights mounted to move the saidconnecting rod axially as the weights move outwardly, a first leverconnected at a point to the connecting rod, said point on the firstlever being movable axially with the connecting rod, an oscillatinglever mounted on a pivot axis which is fixed with respect to thehousing, said oscillating lever positioned in the path of the connectingrod, a spring attached to the oscillating rod and urging the same inopposition to the axial movement of the connecting rod, a follower levermounted for pivoting movement about an axis which is fixed with respectto the housing, a control rod connected to and movable in response tomovements of the follower lever, and an auxiliary lever pivotablyconnected to both the connecting rod and the follower lever, a secondspring urging the auxiliary lever against the first lever in oppositionto the force of the governor weights acting on the auxiliary leverthrough the connecting rod, and a stop element fixed to the oscillatinglever and arranged to abut the auxiliary lever at a fulcrum pointbetween the auxiliary lever pivot points before the control rod engagesthe oscillating lever, the force of the second spring being such that apredetermined force of the governor weights applied to move the controlrod axially, the auxiliary lever will turn about said fulcrum againstthe force of the second spring and thus through its pivot connection tothe follower lever, turn the follower lever to move the control rod tosupercharge the engine.
 2. A centrifugal governor according to claim 1in which said stop element comprises a bolt threadedly engaged in theoscillating lever and engaging said auxiliary lever such that the axialposition of the bolt relative to the oscillating lever and the fulcrumis adjustable.